One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,7)(6,8)(10,13)(14,16)(17,18)(19,23)(20,24)(21,22)(26,28)(30,31) involution — undirected(1,3,6,7)(2,5,8,4)(11,15)(14,16)(18,22)(20,23)(25,26)(27,31)(28,29)(30,32)(1,4,6,5)(2,3,8,7)(9,10)(11,14)(12,13)(15,16)(17,19,21,24)(18,23,22,20)(25,27,29,32)(26,30,28,31)(1,5,6,4)(2,7,8,3)(9,11)(10,14)(12,15)(13,16)(17,20)(18,19)(21,23)(22,24)(25,28,29,26)(27,31,32,30)(1,2)(3,5)(4,7)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19)(18,23)(20,22)(21,24)(25,27)(26,31)(28,30)(29,32) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.